Process of manufacturing insulator pins



Oct. 2, 1928. 1,685,833

A. O. AUSTIN PROCESS 'OF mnummarae msum'ron PINS I Filed did 29. 1922 aSheets-She6t 1 Fly] 1 131.3

63 Mam Gnome Oct. 2, 1928. 1,685,833

A. o. AUSTIN PROCESS OF MANUFACTURING INSU LAIOR PINS Filed July 29.1922 s sheets-sheet 2 INVENTOR (QM M ATTORAEY A. o. 'AusTlN Oct. 2,1.928. I 1,685,833

PROCESS OF MANUFACTURi'NG INSULATOR PINS m'ea July 29.. I922 aShoots-Sheet 5 Patented Oct. 2, 1 928 UNITED STATES ATENT AOFFICE.

' ARTHUB O. AUSTIN, F BARBERTON, OHIO, ASSIGNOB, BY MESN'E ASSIGNMENTS,TO THE OHIO BRASS COMPANY, 01 MANSFIELD, OHIO, A GOBPOBATION 01' NEW Imnsmr.

- PROCESS OF MANUFACTURING INSULA'IOB II'NS.

Application filed July 39, 1922. Serial No. 578,489.

This invention relatesto pins for supporting insulators for electricwires or other electric conductors, particularly on wooden cross arms,and to the method of manufacturing such pins. It has for its object, theprovision of insulator pins which shall beoeflicient in operation,economical to manufacture, convenient to install and in which thestrength of the pin is not im aired by weak portions. Other objects 'wiappear from the following description.

The invention is exemplified in the combination and arrangement of partsshown in the accompanying drawings and described in the followingspecification, and it is more.

particularly pointed out in the appended claims.

In the drawings: Fi 1 is an elevation with parts in'section, showing oneembodiment of the present invention.

Fig. 2 shows a slight modification of the formof the invention shown inFig. 1.

Fig. 3'shows a different modification of the invention.

of the Fig. 4' shows still another form invention. 7

Fig.15 is a section on line 55 of the Fig. 4. Fig. 6 is an elevation ofanother form of the invention.

Fig. 7 is an elevationof still a different.

modification. I

Referring first togthe form of the invention shown in Fig. 1-, the in isshown therein having an n er port on 10 and a-lower I portion 11 wh 1cma be formed from a single piece of stock, t e two portions being of theoriginal diameter of the-stock. Between the-parts 10 and 11 is anenlarged 4 portion 12 which is formed b upsettin the rod'from which thepin isma e' interme iate the-upper and lower portions '10'and11. -'Informing the upset portion 12, therod is grasped at spaced position by apower tool and the parts thus grasped are moved toward one another toupset the material and thus form the enlargement. 12. This 0 eration maybe performed with the stock either hot or cold.

The jaws which grasp the'rod are shaped to provide dies for forming theupset or en- 'larged portion. This enlargement provides a stop whichengages a supporting member or flange 13 which rests on the support forthe pin which may be a cross arm or other suitable supporting structure.The flange 13 is provided with an opening having a tapered surface 14 toconform to the tapered surface 15 of the enlarged portion 12. Below thetapered portion 14, a straight part '16 may be provided to engage aportion of the shank 11, but the top parts may be shaped to providetapered surfaces thruout" the entire length of engagement. The lower Yend of the part 11 may be secured to theunder side'of the supportingstructure by 1 means of a nut 17 engaging threads 18 meansof securingthe pin in place ."in' the opening may, of course, be employed. Byincreasing the size of the pin to pro vide a bearing, the shank 11 mayhave the same diameter as the upperportion of the pm, thus providing alarger bearing surface of the pin on the interior of'the openin thru thecross arm, than would be possi le if the lower portion of the pinwereneduced to provide a supporting shoulder. This also securesreinforcement for the pin at the to of the supporting member 13 wherethe hen in moment due to the load is greatest.

formed on the lowerend of the pin. Other 1 n the form of su port shown'in Fig. 2, I

the upset portion 12 1s provided in the inan- -ner described inconnection with Fig. 1, and the supportingfiange 19 is similar to theflange 13 except that it is permitted to extend above the line 20 ofmaximum diameter of the pin. The portion 21 which extends above the line20 is pressed inwardl against the-inwardly tapering portion. of theenlargement 12. This may bev accomplished by a suitable die pressed ainst the upper end of'the S11 port 19. A 'r the support. is in place ont e pin the art may be turned in in any' other suitab e manner. en

once pressed into place it provides an efiecthey ma be galvanized after.they. are inlace an the galvanized coatin will assist in holding the;parts against re ative movement. 1.

In the form of the invention shown in Fig. 3, the pin is I lower parts21 an 22 respectively, and an intermediate enlarg d part 23 which isprovided with upper'and formed by upsetting the stock between the endsof the pins as previously described. In this form of pin, however, inplace of the tapered bearing 15 the upset portion is threaded to receivea threaded flange member 24:. The threads may be cut in the expandedpart 23, but in some cases it may be more economical to roll rather thanto cut the threads.

It will be noted that the threads do not weaken the pin as they areformed in the stock bulged outwardly by the upset process and do notenter the stock sufiiciently deep toprovide a diameter at the roots ofthe threads less than the original diameter of the stock. The rootdiameter of the threads may be as shown in the drawing, even greaterthan the diameter of the remaining por tion of the pin.

In the form of invention shown in Figs. 4 and 5, the rod 25 is upsetbet-ween the ends to form a ring 26 which rests upon the upper portionof the supporting member 27. The ring may be discontinued for a portionof the periphery of the rod as shown in 28 and a projection 29 isprovided to register with the opening 28 in the ring 26 and limit therotary movement of the pin in its support. Since the lower portion ofthe pin is the full size of the rod, it will 'have a sufficient bearingin the opening thru thecross arm to tand lateral stresses and the chieffunction of the support 27 will be merely to support the pin, againstdownwardmovement. It is necessary, therefore, to provide a tight fitbetween the pin and its support, but the parts may be permitted to fitsufiiciently loosely to allow a limited rotary movement of the pin foralignment of the supporting groove in the insulator with the line wire.

In Fig. 6 a pin 30 is upset between its ends to form an enlargement 31which is hexagonal in cross section and tapered to fit into acorrespondingly shaped socket in a supporting member having a flange 32curved to fit the top of a rounded cross arm. The flange 32 may havelugs 33 to engage the sides of the cross arm and teeth 34 to assist inholding the flange and consequently the pin against rotation.

The pin 35 shown in Fig. 7 is upset to provide an angular shapedenlargement 36 at its central portion. The enlargement 36 is tapered inboth directions so that it may be placed in the tapered seat of thesocket 37, either end up. If the ends of the pin are of differentlengths this makes 'it possible to use one style of pin for more than.one set of conditions. This support 37 has the edges 38 of the flange39 bent downwardly to grasp the sides of the cross arm.

lVhere the body of the pin is of the same diameter both above and belowthe flange,

' a relatively small base may be used as the portion below the flangecan act as a beam being held in position by its bearing on the sides ofthe hole in the cross arm. Since little dependence need be placed on theortion in the arm acting as a tension mem er, the shrinkage of the armand release of tension will have little effect upon the carryingcapacity of the in.

In general, the riction in the tapered base prevents rotation of thebody when same is tightened on the arm. Where it is desired, the taperedsection fitting into the base may be made into the frustum of ahexagonal pyramid or any other suitable shape as shown in Figs. 6 and 7.This section engages a corresponding socket in the base which in turn islocked to the arm by lugs or an overlap on the arm. In most cases, thecurvature of the base and a roofed arm are suflicient to lock the pinfrom rotation.

I claim:

1. The process of manufacturing insulator pins comprising the steps ofupsetting a metal bar between its ends to produce an enlargementthereon, separately forming a supporting. member and applying saidmember to said enlargement to form a support for said pin.

2. The process of manufacturing an insulator pin comprising the steps ofupsetting between its ends, a bar of substantially uniform diameter toprovide an enlarged reinforcing portion, separately forming a supportingflange with a sleeve to fit said enlarged reinforcing portion andapplying,

said supporting flange to said enlarged reinforcing portion.

3. The process of manufacturing insulator pins comprising the steps ofupsetting a bar between its ends, to provide an enlarged portion,tapering the enlarged portion, separately forming a support having asleeve thereon, shaping said sleeve to fit said enlarged tapered portionand applying said sleeve to said enlarged tapered portion.

4. The process of manufacturing insulator pins comprising the steps ofupsetting, between its ends, a bar of substantially uniform diameter toprovide an enlarged reinforcing portion, tapering said enlargedreinforeing portion toward one end of said pin by said upsettingoperation, and shaping said enlarged portion by said upsettingoperation-to a non-circular contour, separately forming a support havinga sleeve thereon, shaping said sleeve to fit the tapered noncircularportion of said bar and applying said sleeve to said enlarged portion.

Intestimony whereof I have signed my name to this specification on this25th day of July, A. D. 1922.

ARTHUR o. AUSTIN.

